diff --git a/g3tiles/doc/configuration/servers/openssl_proxy.rst b/g3tiles/doc/configuration/servers/openssl_proxy.rst
index 6ceb2203..0707cbbb 100644
--- a/g3tiles/doc/configuration/servers/openssl_proxy.rst
+++ b/g3tiles/doc/configuration/servers/openssl_proxy.rst
@@ -77,6 +77,17 @@ Set if we should send TLS alert when no host config can be recognized.
 
 **default**: false
 
+tls_no_async_mode
+-----------------
+
+**optional**, **type**: bool
+
+Set to true to disable the use of OpenSSL async engine if `openssl-async-job` feature is enabled.
+
+**default**: false
+
+.. versionadded:: 0.3.7
+
 virtual_hosts
 -------------
 
diff --git a/g3tiles/src/config/server/openssl_proxy/mod.rs b/g3tiles/src/config/server/openssl_proxy/mod.rs
index a722fe4e..9c9e5406 100644
--- a/g3tiles/src/config/server/openssl_proxy/mod.rs
+++ b/g3tiles/src/config/server/openssl_proxy/mod.rs
@@ -56,6 +56,8 @@ pub(crate) struct OpensslProxyServerConfig {
     pub(crate) tcp_copy: LimitedCopyConfig,
     pub(crate) tcp_misc_opts: TcpMiscSockOpts,
     pub(crate) tls_ticketer: Option<TlsTicketConfig>,
+    #[cfg(feature = "openssl-async-job")]
+    pub(crate) tls_no_async_mode: bool,
     pub(crate) spawn_task_unconstrained: bool,
     pub(crate) alert_unrecognized_name: bool,
 }
@@ -80,6 +82,8 @@ impl OpensslProxyServerConfig {
             tcp_copy: Default::default(),
             tcp_misc_opts: Default::default(),
             tls_ticketer: None,
+            #[cfg(feature = "openssl-async-job")]
+            tls_no_async_mode: false,
             spawn_task_unconstrained: false,
             alert_unrecognized_name: false,
         }
@@ -202,6 +206,11 @@ impl OpensslProxyServerConfig {
                 self.tls_ticketer = Some(ticketer);
                 Ok(())
             }
+            #[cfg(feature = "openssl-async-job")]
+            "tls_no_async_mode" => {
+                self.tls_no_async_mode = g3_yaml::value::as_bool(v)?;
+                Ok(())
+            }
             "spawn_task_unconstrained" | "task_unconstrained" => {
                 self.spawn_task_unconstrained = g3_yaml::value::as_bool(v)?;
                 Ok(())
diff --git a/g3tiles/src/serve/openssl_proxy/task/accept.rs b/g3tiles/src/serve/openssl_proxy/task/accept.rs
index a9dc5fe4..2fd956d6 100644
--- a/g3tiles/src/serve/openssl_proxy/task/accept.rs
+++ b/g3tiles/src/serve/openssl_proxy/task/accept.rs
@@ -253,9 +253,13 @@ impl OpensslAcceptTask {
     #[cfg(feature = "openssl-async-job")]
     fn build_ssl(&self, ssl_ctx: &SslContext) -> Result<Ssl, ErrorStack> {
         use openssl::ssl::SslMode;
+        use tokio::runtime::{Handle, RuntimeFlavor};
 
         let mut ssl = Ssl::new(ssl_ctx)?;
-        if self.ctx.cc_info.worker_id().is_some() {
+        if self.ctx.server_config.tls_no_async_mode {
+            return Ok(ssl);
+        }
+        if Handle::current().runtime_flavor() == RuntimeFlavor::CurrentThread {
             ssl.set_mode(SslMode::ASYNC);
         }
         Ok(ssl)